73 Pammoi Shells. TvsxTimf)-^- Panania; Jay, Panama; C. B. A- \ We collected on the reef 275 specimens. ' 64. Buccinum sanguinolentum. Synonymy. Purpura sanguinolenta Duel, in Guer. Mag. Zool. pi. 22. f. 1. 1833. Pollia hxmastoma Gray in Zool. Beech. Voy. p. 112. 1839. Buccinum hcemastoma Reeve Conch. Icon, pi, 1. f, 46, Dec, 1846. Janelii Val, Voy. Venus. Moll. pi. 6. f. 1. 1846, ., sanguinolentumMenke in Zeilsch. Malak. p. 180. Dec. 1847. /Station.—Under stones at low water; Cuming 1 Reeve. A few of our specimens were found alive in the same situa¬ tion ; but as most of them were occupied by hermit crabs, at low water mark, it is probable that their favorite station may be somewhat lower. Habitat.—Panama; Cuming! Reeve. Mazatlan; Melchers! Menke. Panama; Jay. Taboga and Panama; C. B. A. We collected 16 specimens. 65. Buccinum Stimpsonianum. Nov. Sp. Shell long ovate-conic: rather pale slate color, more or less white above, with the revolving ridges brownish red or white where they cross the ribs, white in the upper half of the labrum, often with a broad white spiral band on the middle of the whorls: on each whorl with seven or eight stout transverse ridges, which are less prominent on the back of the last whorl; with several spiral linear ridges, of which four are visible on the penult whorl, which are obsolete between the transverse ridges, and are more numerous and smaller anteriorly; covered